Externally applied carbon-fibre-reinforced polymer (CFRP) laminate is a viable, economic and durable option for strengthening deteriorated, damaged or under-designed concrete structures. Effective stress transfer at the CFRP–concrete interface is an important consideration and quantitative on-site inspection of CFRP application quality is still a challenging issue. In this study, a ground penetrating radar scanning approach was used to examine the bond quality in small-scale concrete beams with flexurally applied CFRP laminates. The parameters considered included the concrete surface roughness, concrete surface voids, epoxy thickness and CFRP type. A three-point bending test and numerical modelling were used to develop simple quantitative relationships between the scanning results and the parametric combinations. Non-destructive evaluation techniques are convenient and provide valuable information for the prediction of the interfacial bond quality and the actual capacity contribution of the CFRP laminate, which will allow a higher confidence level in CFRP application quality and better quality control of concrete structures.

中文翻译：

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使用探地雷达进行纤维增强聚合物层压板-混凝土粘结检查

外部应用的碳纤维增强聚合物 (CFRP) 层压板是一种可行、经济且耐用的选择，可用于加固劣化、损坏或设计不足的混凝土结构。CFRP-混凝土界面处的有效应力传递是一个重要的考虑因素，CFRP 应用质量的定量现场检查仍然是一个具有挑战性的问题。在这项研究中，使用探地雷达扫描方法来检查具有弯曲应用的 CFRP 层压板的小型混凝土梁的粘合质量。考虑的参数包括混凝土表面粗糙度、混凝土表面空隙、环氧树脂厚度和 CFRP 类型。使用三点弯曲试验和数值建模来建立扫描结果和参数组合之间的简单定量关系。